linux-kernel - [PATCH] IPC: Initialize structure memory to zero for compat_sys_mq

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Date:	Wed, 06 Oct 2010 21:01:34 -0400
From:	Dan Rosenberg <drosenberg@...curity.com>
To:	linux-kernel@...r.kernel.org
Cc:	security@...nel.org, stable@...nel.org
Subject: [PATCH] IPC: Initialize structure memory to zero for
 compat_sys_mq_*

The "reserved" member should be zeroed before copying back to userspace
to avoid leaking uninitialized kernel stack memory.

Signed-off-by: Dan Rosenberg <drosenberg@...curity.com>

--- linux-2.6.35.5.orig/ipc/compat_mq.c	2010-09-20 16:59:09.000000000 -0400
+++ linux-2.6.35.5/ipc/compat_mq.c	2010-10-06 20:55:08.000000000 -0400
@@ -52,7 +52,7 @@ asmlinkage long compat_sys_mq_open(const
 {
 	void __user *p = NULL;
 	if (u_attr && oflag & O_CREAT) {
-		struct mq_attr attr;
+		struct mq_attr attr = {};
 		p = compat_alloc_user_space(sizeof(attr));
 		if (get_compat_mq_attr(&attr, u_attr) ||
 		    copy_to_user(p, &attr, sizeof(attr)))
@@ -123,7 +123,7 @@ asmlinkage long compat_sys_mq_getsetattr
 			const struct compat_mq_attr __user *u_mqstat,
 			struct compat_mq_attr __user *u_omqstat)
 {
-	struct mq_attr mqstat;
+	struct mq_attr mqstat = {};
 	struct mq_attr __user *p = compat_alloc_user_space(2 * sizeof(*p));
 	long ret;
 


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